Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd9a8e40f01312…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 04:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: df28708762318ab3a5ad443b22b9eb53 SHA-1: 1731fcc96337a719621be8e235a18e1fb9b19d6c SHA-256: 3dcd9a8e40f0131246e2e10108bbfa1bdf0a5672a69b8a1efb62a2f30be77330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external links. The ML classifier and ClamAV also identified it as malicious. The primary malicious indicator is the presence of a large number of external links, with one pointing to 'https://pelibifir.ru/strik?utm_term=sample+batch+record', suggesting a phishing or SEO manipulation attempt. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=sample+batch+record PDF link annotation
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/9a8946aa.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/daf87ca2c.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/4321437.pdfIn PDF document text
    • https://gixeguxif.weebly.com/uploads/1/3/4/5/134522915/vetefu.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/f98271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_60305bd3bc189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ff8fbb0bdd48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_604cb900be319.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/gidix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5ff408ae2191d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/word_format_resume_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/sqlite_android_database_query.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/bitsat_2019_form_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/7620671850.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/futurama_fry_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/apa_style_guide_citations.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/foxtel_tv_guide_perth_wa.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/bangkok_mrt_bts_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/95774695985.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/10589509965.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 5376 bytes
SHA-256: d796649ded0c28dba58b92e5536c1405f966a658475888ec1c65b6989b3d533c
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 11184 bytes
SHA-256: 9c6f22eda96b2e4f289382143b40ac30f321b4cbb09f8ab64fb425412d1a932c

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